Moneys in the Guam Streetlight Authority Revenue Fund may be invested by the Authority and any revenues in any other fund or account held by or on behalf of the Authority or its agent may be invested by the Authority or its agent, as the case may be, in any investment authorized by any indenture providing for the issuance of bonds. All interest or other earnings received pursuant to such investments shall be collected by the Authority or its agent, as the case may be, and shall be deposited to the credit of the fund or account from which such interest or other earnings are derived, unless otherwise provided in an indenture.